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RT9245BPC Datasheet(PDF) 13 Page - Richtek Technology Corporation

Part # RT9245BPC
Description  Multi-Phase PWM Controller for K8 CPU Core Power Supply
PDF  23 Pages
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Manufacturer  RICHTEK [Richtek Technology Corporation]
Direct Link  http://www.richtek.com
Logo RICHTEK - Richtek Technology Corporation

RT9245BPC Datasheet(HTML) 13 Page - Richtek Technology Corporation

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RT9245B
13
DS9245B-02
March 2007
www.richtek.com
Figure 7. The Over Current Protection in the soft start
interval
CH1:(5V/Div)
CH2:(5V/Div)
Over Current Protection
Time (25ms/Div)
PWM
VSS
Figure 8. Over Current Protection at steady state
Current Ratio Setting
For some case with preferable current ratio instead of
current balance, the corresponding technique is provided.
Due to different physical environment of each channel, it
is necessary to slightly adjust current loading between
channels. Figure 9 shows the application circuit of GM for
current ratio requirement. Applying KVL along L+DCR
branch and R1+C//R2 branch :
L
2
1
C
C
2
2
1
C
1
C
C
2
C
1
L
L
I
DCR
R
R
R2
V
For
V
R
R
R
dt
dV
C
R
V
)
dt
dV
C
R
V
(
R
I
DCR
dt
dI
L
×
+
=
+
+
=
+
+
=
×
+
Look for its corresponding conditions :
C
(R1//R2)
DCR
L
Let
I
DCR
dt
dI
DCR
C
(R1//R2)
I
DCR
dt
dI
L
L
L
L
L
×
=
×
+
×
×
×
=
×
+
CH1:(5V/Div)
CH2:(5V/Div)
Over Current Protection
Time (25ms/Div)
PWM
VSS
With internal current balance function, this phase would
share (R1+R2)/R2 times current than other phases.
Figure 10 & 11 show different settings for the power stages.
Figure 12 shows the performance of current ratio compared
with conventional current balance function in Figure 13.
Thus if
C
(R1//R2)
DCR
L
×
=
Then
L
C
I
DCR
R2
R1
R2
V
×
×
+
=
Figure 10. GM4 Setting for current ratio function
Figure 11. GM1~3 Setting for current ratio function
Figure 9. Application circuit for current ratio setting
0.3uH
0.6m
470
1uF
IL
0.3uH
0.6m
470
1uF
470
IL
L
DCR
R1
C
R2
IL
+VC-



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